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Firebase Authentication with Android
Firebase Authentication with Android
Today we use Firebase Authentication with our app. We use a Google SignIn to authenticate with firebase. when any user Sign-In with google we get a Uid for that user and details of creation and last signed in of that user.
To create Firebase Authentication with Android. Follow the steps
- Create a project in android studio and connect with firebase.
 |
| Connect to Firebase in Android |
- After connecting to Firebase, then do a code for Firebase Authentication.
In our FirebaseUi activity, we add a sign in with the google login button to authenticate a user with firebase.
firebaseui.xml
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".FireBaseUi"
>
<com.google.android.gms.common.SignInButton
android:id="@+id/sign_in_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
FirebaseUi.java
package studio.harpreet.firebaseui;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInClient;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.ApiException;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.FirebaseApp;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.GoogleAuthProvider;
public class FireBaseUi extends AppCompatActivity {
private static final String TAG = "LoginActivity";
private static final int RC_SIGN_IN = 1001;
GoogleSignInClient googleSignInClient;
private FirebaseAuth firebaseAuth;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fire_base_ui);
FirebaseApp.initializeApp(this);
SignInButton signInButton = findViewById(R.id.sign_in_button);
signInButton.setOnClickListener(new View.OnClickListener() {
@Override public void onClick(View view) {
// Launch Sign In
signInToGoogle();
}
});
// Configure Google Client
configureGoogleClient();
}
private void configureGoogleClient() {
// Configure Google Sign In
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
// for the requestIdToken, this is in the values.xml file that
// is generated from your google-services.json
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build();
// Build a GoogleSignInClient with the options specified by gso.
googleSignInClient = GoogleSignIn.getClient(this, gso);
// Set the dimensions of the sign-in button.
SignInButton signInButton = findViewById(R.id.sign_in_button);
signInButton.setSize(SignInButton.SIZE_WIDE);
// Initialize Firebase Auth
firebaseAuth = FirebaseAuth.getInstance();
}
@Override
public void onStart() {
super.onStart();
// Check if user is signed in (non-null) and update UI accordingly.
FirebaseUser currentUser = firebaseAuth.getCurrentUser();
if (currentUser != null) {
Log.d(TAG, "Currently Signed in: " + currentUser.getEmail());
showToastMessage("Currently Logged in: " + currentUser.getEmail());
}
}
public void signInToGoogle() {
Intent signInIntent = googleSignInClient.getSignInIntent();
startActivityForResult(signInIntent, RC_SIGN_IN);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
if (requestCode == RC_SIGN_IN) {
Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
try {
// Google Sign In was successful, authenticate with Firebase
GoogleSignInAccount account = task.getResult(ApiException.class);
showToastMessage("Google Sign in Succeeded");
firebaseAuthWithGoogle(account);
} catch (ApiException e) {
// Google Sign In failed, update UI appropriately
Log.w(TAG, "Google sign in failed", e);
showToastMessage("Google Sign in Failed " + e);
}
}
}
private void firebaseAuthWithGoogle(GoogleSignInAccount account) {
Log.d(TAG, "firebaseAuthWithGoogle:" + account.getId());
AuthCredential credential = GoogleAuthProvider.getCredential(account.getIdToken(), null);
firebaseAuth.signInWithCredential(credential)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
// Sign in success, update UI with the signed-in user's information
FirebaseUser user = firebaseAuth.getCurrentUser();
Log.d(TAG, "signInWithCredential:success: currentUser: " + user.getEmail());
showToastMessage("Firebase Authentication Succeeded ");
launchMainActivity(user);
} else {
// If sign in fails, display a message to the user.
Log.w(TAG, "signInWithCredential:failure", task.getException());
showToastMessage("Firebase Authentication failed:" + task.getException());
}
}
});
}
private void showToastMessage(String message) {
Toast.makeText(FireBaseUi.this, message, Toast.LENGTH_LONG).show();
}
private void launchMainActivity(FirebaseUser user) {
if (user != null) {
MainActivity.startActivity(this, user.getDisplayName());
finish();
}
}
}
After Sign-In we will open MainActivity.
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity"
>
<TextView
android:id="@+id/textViewWelcome"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="32dp"
android:text="welcome"
android:gravity="center"
/>
<Button
android:id="@+id/buttonLogout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="logout"
android:textAllCaps="false"
/>
</LinearLayout>
MainActivity.java
package studio.harpreet.firebaseui;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import androidx.annotation.NonNull;
import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInClient;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private static final String USERNAME = "username";
Button logout;
TextView username;
public static void startActivity(Context context, String username) {
Intent intent = new Intent(context, MainActivity.class);
intent.putExtra(USERNAME, username);
context.startActivity(intent);
}
FirebaseAuth firebaseAuth;
GoogleSignInClient googleSignInClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
username = findViewById(R.id.textViewWelcome);
logout = findViewById(R.id.buttonLogout);
if (getIntent().hasExtra(USERNAME)) {
username.setText(String.format("Welcome - %s", getIntent().getStringExtra(USERNAME)));
}
logout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
signOut();
}
});
googleSignInClient = GoogleSignIn.getClient(this, GoogleSignInOptions.DEFAULT_SIGN_IN);
firebaseAuth = FirebaseAuth.getInstance();
}
private void signOut() {
// Firebase sign out
firebaseAuth.signOut();
// Google sign out
googleSignInClient.signOut().addOnCompleteListener(this,
new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
// Google Sign In failed, update UI appropriately
Log.w(TAG, "Signed out of google");
}
});
}
}
- Then open Authentication from the right menu.
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| Firebase Authentication in Firebase Console |
- Then under Sign-In method enable Google Sign-In.
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| Enable Google Sign-In with Firebase Authentication |
- Then open console.developers.google.com and open your project and create an OAuth client Id and copy that client id.
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| OAuth Client Id on Google Developer console |
- Then Copy that client Id and paste it in your string.xml
strings.xml
<string name="default_web_client_id">721******742-6s4q******qsmppom*******9516***m.apps.googleusercontent.com</string>
- Then run your app and sign in with your Google account and see the user and account id in the Users tab in authentication menu in Firebase Console.
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